Neo Backgrounds
Neo backgrounds are trading cards that will be released in the future. To go there, click on stuff >> backgrounds. Most of the time images from here are overused. Why? Because many people think that this is the only place to get good images, but that is not true. Though if you are working on something big- like a userlookup and need a very big image, you can download it and save and paste and it will be jumbo sized without looking the littlest bit stretched ;). If you are looking for a specific theme of image, search it in the bar near the top. Remember that they use key words, which means that you can only search one word.

Caption Contest
This is a pretty good place to find un-overused images. You can access it by searching in the neopets search bar "caption" and it should come up. If you are trying to find a specific theme though- which is usually the case it takes SO long to find the right theme. Not much more to say than that ;).

TCG cards
This is the place I use the most. To go there, click here. There are tons of great non-overused images there. To see (and copy) an image, simply click on the name of the card. To find a specific theme, hold Ctrl+F and type in a keyword. You can find different editions near the top of the page. But these images tend to be a bit small, so you'll have to blend a lot with these. Also, when you paste it in your program, you'll have to get rid of the extra parts. Just erase it and it'll be fine :D.

Greetings
Greetings are probably the last thing you would think of on where you would get images o_0. But the images (greetings) are underused and they're good sized. You can take a look at them by going to neomail >> greetings. Obviously if you are looking for a specific theme, type a keyword in the bar. Since most of them you can't copy these by just going right click >> copy (it's flash), you'll have to take a screen shot and crop. Do this by pressing prnt scrn on your keyboard. You'll have to time it at the right time when you take a screenshot, since you won't want the neopet that's in it to have their eyes closed or something o_0. If the neo greeting you chose is not animated you can just copy and paste :D. After you take the screen shot, crop it.

Neopets Games
I know it sounds ridiculous, but the neopets games are one of the best places for big and non overused neopets images. Just look for a game with the theme you want and open it up to an appropriate size. For example, if you were making a huge banner for a userlookup, you would go to full screen mode. Just like the greetings, you can't just copy and paste, you have to take a screenshot and crop.

I hope that helped you find good places for background images, and good luck with your graphics making!

~Nicolette